Blade sharpener for lawn mowers



H. T. WALKER BLADE SHARPENER FOR LAWN MOWERS I Dec; 13, 1938.

Fi led Aug. 5, 1957' Th/aller 7 20. By means of the slot IS, the guide may be Patented Dec. 13, 1938 PATENT OFFICE BLADE SHARPENER FOR. LAWN MOWERS Horace T. Walker, Columbia, Ky.

Application August 5,

1 Claim.

This invention relates to devices for sharpening lawnmower blades and particularly to a device for 'thispurpose which includes a handle carrying a'file or like abrading element and a guide which .l 'isadapted to engage a cross-bar of the mower when the file is resting upon one of the mower of the mower blade.

- The general object of my invention is to pro,-

ply constructed and cheaply made and which is I provided with a guide which is adjustable toward or from the file holding portion of the device so.

[*as to'permit thedevice to be used on various makes of lawn mowers.

, Another object is to provide, means for holding the file firmly in place which means, however, will permit this file or abrading element to be adjusted.

, My invention is illustrated in the accompanying drawing whereinz- 1 is an elevation of my blade sharpening device, the figure showing. a portion of a mowing machine in dotted lines-to illustrate theapplication of the sharpener. Fig. 2 is an underside plan view of the sharpener. I

Fig. 3. is a section onthe line 33 ofFig. 1. Referring to this drawing, I0 designates'a bar ofwood or other suitable material having a length of somewhat over a foot and being formed with handle portions ll adjacent its ends. This bar is'flat on its underface andadjacent one handle 'of the bar there is formed the T-shaped slot H, which opens upon the underfaceof the bar. A setQscrew I3 extends through the bar and is adapted to bear against a'small section of file or other abrading element l4. As illustrated, the abrading element is narrower than the length 'of the head of slot l2 but wider than the mouth 'of'the'slot. The length of the portion 12 of the -slot-permits flat files of different widths to beused.

' Adjacent the other handle ll there is formed a longitudinally extending slot I5 and disposed against the underface-of the bar I0 is a U-shaped guide IS. A bolt l1 passes through the upper end of the guide and through the slot l5 and is en- ;gaged by a nut l8. Extending through the guide I is a bolt l9v and mounted upon this bolt is a roller vide a device of this character which is very sim- 1937, Serial N0. 157,625

adjusted nearer to or further from the abrading element I4.

In the use of this device, the guide I9 is disposed to embrace a cross-bar 2| of a mowing machine, as shown in Fig. 1, with the roller resting upon this cross-bar. I'he edge of the blade is inserted through the mouth of slot I! so that the abrading element bears against the beveled edge of the blade. When the bar is reciprocated longitudinally of the blade, the blade will turn so that the toothed face of the abrading element will bear against and file away the metal on the beveled face of the blade and, of course, sharpen the blade at the proper angle for cutting. By having the guide I6 adjustable toward or from the file M, the device is adapted to be adjusted to suit any ordinary mowing machine having a revolving series of blades. Obviously in place of the file M, a honing element may be disposed within the slot I2 and, of course, the set screw l3 will hold this honing element or the file rigidly in place.

What is claimed is:

A lawn mower sharpening device, comprising a bar having a portion of each end formed to provide a handle, the bar having a T-shaped slot cut transversely thereinto and opening through one face, said slot being designed to receive a body having a cutting face, means carried by the bar and extending into the slot for securing said body therein whereby the said cutting face may be engaged by the end of a blade extended into the slot and disposed transversely of the bar, said bar having an elongated slot formed longitudinally therethrough adjacent the handle remote from the T-slot, a substantially U-shaped member having two side portions and a flat yoke portion connecting the side portions, said yoke portion being disposed against the side of the bar through which the T-shaped slot opens and lying over said elongated slot, a pin extending across and connecting the side portions of the U-shaped member, a roller carried upon said pin, said U- shaped member being designed to receive a cross brace bar of the lawn mower and said roller being designed to rest upon said bar, a bolt extending through the aperture of the yoke of the U-member and through said slot, and means engaging said bolt to secure the U-member against the slotted bar.

HORACE T. WALKER. 

